Today I upgraded 2 of my 4 machines from RELENG_7 to RELENG_8.
Both of the 2 machines are just LDAP clients.
My LDAP server is still running on RELENG_7,
and the remained one is also a LDAP client.
All of them were installed OpenLDAP-2.4.21 and nss_ldap-1.265_3.

Before I upgrades my system, everything works properly.
I added a group named `group1' on LDAP server,
and then add a user named `user1' to this group.
I can type `id user1' to see the following line:
  uid=3000(user1) gid=3000(user1) groups=3000(user1),10000(gorup1)

Of course, now the following record is already my LDAP server:
--
dn: cn=group,ou=group,dc=mydomain,dc=org
objectClass: posixGroup
cn: group1
gidNumber: 10000
memberUid: user1
--

After I upgraded these 2 machines from RELENG_7 to RELENG_8,
to type `id user1' could only show the following information:
  uid=3000(user1) gid=3000(user1) groups=3000(user1)
This user's supplementary group was gone,
and he couldn't write any group-writable files which had gid 10000 one the 2 
machines.
But in my other 2 machines that running on RELENG_7,
this problem is still not occured.

I have logged the behaviors of RELENG_7 & RELENG_8.
Here is the behavior when I type `id user1' on RELENG_7:
--
conn=1007 op=2 SRCH base="ou=people,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixAccount)(uid=user1))"
conn=1007 op=2 SRCH attr=uid userPassword uidNumber gidNumber cn homeDirectory 
loginShell gecos description objectClass shadowLastChange shadowMax 
shadowExpire loginClass

conn=1007 op=3 SRCH base="ou=group,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixGroup))"
conn=1007 op=3 SRCH attr=cn userPassword memberUid uniqueMember gidNumber

conn=1007 op=4 SRCH base="ou=group,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixGroup)(gidNumber=3000))"
conn=1007 op=4 SRCH attr=cn userPassword memberUid uniqueMember gidNumber

conn=1007 op=4 SRCH base="ou=group,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixGroup)(gidNumber=3000))"
conn=1007 op=4 SRCH attr=cn userPassword memberUid uniqueMember gidNumber

conn=1007 op=4 SRCH base="ou=group,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixGroup)(gidNumber=10000))"
conn=1007 op=4 SRCH attr=cn userPassword memberUid uniqueMember gidNumber
--
In step 2, it tries to fetch out the full group list from my LDAP server.
According to this information, it can know what user1's supplementary groups 
are.

RELENG_8:
--
conn=1008 op=2 SRCH base="ou=people,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixAccount)(uid=user1))"
conn=1008 op=2 SRCH attr=uid userPassword uidNumber gidNumber cn homeDirectory 
loginShell gecos description objectClass shadowLastChange shadowMax 
shadowExpire loginClass

conn=1008 op=3 SRCH base="ou=group,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixGroup)(gidNumber=3000))"
conn=1008 op=3 SRCH attr=cn userPassword memberUid uniqueMember gidNumber

conn=1008 op=3 SRCH base="ou=group,dc=mydomain,dc=org" scope=1 deref=0 
filter="(&(objectClass=posixGroup)(gidNumber=3000))"
conn=1008 op=3 SRCH attr=cn userPassword memberUid uniqueMember gidNumber
--
It never tried to get the group list from LDAP server,
hence it's impossible to know user1's supplementary groups.

The client settings on RELENG_7 & RELENG_8 are fully consistent,
so I don't think it's the problem of my config files.
Since my 4 machines use the same version of nss_ldap,
to downgrade nss_ldap's version for testing is meaningless.

Should this problem is a base system's bug?
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